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Identifying Precipitation Types and Intensity Changes

Rain Begins

  • Dry Target
    • Look for multiple drops on the target (Day/Night)
    • Speed slide video to determine good start time (D/N)
  • Wet Target
    • Look for drops on target (D/N)
    • Look for drops in puddles (D)
    • Look for drops in reservoir, if reservoir is filled (D/N)
    • Speed slide video to determine good start time (D/N)
  • Note: Fall streak tends to be straight (D/N)

Rain Intensity Change

  • Increasing
    • Larger drops hitting target (D/N) 
    • More splashing in puddles (D)
    • More splashing in reservoir if filled (D/N)
    • Pause video look for increase in number of drops per volume (D/N)
    • Speed slide video to determine increase time (D/N) (Static Cameras)
    • Target saturation increases (D/N)
  • Decreasing
    • Larger drops diminish (D/N) 
    • Less splashing in puddles (D)
    • Less splashing in reservoir if filled (D/N)
    • Pause video look for decrease in number of drops per volume (D/N)
    • Speed slide video to determine decrease time (D/N) (Static Cameras)
    • Target saturation decreases (D/N)

Rain Ends

    • No more fall streaks (D/N)
    • No more splashing puddles (D)
    • No more splashing reservoir (D/N)
    • Speed slide video to determine good end time (D/N)

Snow Begins

  • Dry Target
    • Look for multiple opaque flakes/pellets on the target (Day/Night)
    • Speed slide video to determine good start time (D/N)
  • Wet Target
    • Look for opaque flakes/pellets on target (D/N)
    • Speed slide video to determine good start time (D/N)
    • Wide views reduction in visibility (D/N)
  • Note:  Floating motion (D/N)
  • Pellets that are opaque slightly bounce and roll (D/N)
  • Note: Shows up much brighter than rain (D/N)

Snow Intensity Change

  • Increasing
    • More opaque pellets/flakes accumulate on target/ground (D/N)
    • Wide view visibility drop (D/N)
    • Pause video look for increase in number of opaque pellets/flakes per volume (D/N)
    • Speed slide video to determine increase time (D/N) (Static Cameras)
    • Increase of snowflake size (D/N)
  • Decreasing
    • Slowing of opaque pellets/flakes accumulating on target/ground (D/N)
    • Wide view visibility increase (D/N)
    • Pause video look for decrease in number of opaque pellets/flakes per volume (D/N)
    • Speed slide video to determine decrease time (D/N) (Static Cameras)
    • Decrease of snowflake size (D/N)

Snow Ends

  • No more fall streaks (D/N)
  • No more accumulation (D/N)
  • Speed slide video to determine good end time (D/N)

Ice Pellets Begins

  • Dry Target
    • Look for translucent pellets bouncing on the target (Day/Night)
    • Speed slide video to determine good start time (D/N)
  • Wet Target
    • Look for translucent pellets sticking on target (D/N)
    • Look for drops and floating ice in puddles (D)
    • Look for drops in reservoir, if reservoir is filled (D/N)
    • Speed slide video to determine good start time (D/N)
  • Look at pellets bouncing off of objects (Roaming Camera) (D/N)
  • Note: Zoom into videos to see bouncing clearer (D/N)

Ice Pellets Intensity Change

  • Increasing
    • Wide view visibility drop (D/N)
    • Pause video look for increase in number of translucent pellets per volume (D/N)
    • Speed slide video to determine increase time (D/N) (Static Cameras)
    • Increase of bouncing off objects/target (D/N)
    • Look for increase of translucent pellets and splashing, if reservoir is filled (D/N)
  • Decreasing
    • Wide view visibility increase (D/N)
    • Pause video look for decrease in number of translucent pellets per volume (D/N)
    • Speed slide video to determine decrease time (D/N) (Static Cameras)
    • Decrease of bouncing off objects/target (D/N)
    • Look for decrease of translucent pellets and splashing, if reservoir is filled (D/N)
  • Note: Zoom into videos to see bouncing clearer (D/N)
  • Note: Different cores Liquid splat, solid bounce (D/N)

Ice Pellets Ends

  • No more fall streaks (D/N)
  • No more accumulation (D/N)
  • No more splashing (D/N)
  • Speed slide video to determine good end time (D/N)

Drizzle Begins

  • Dry Target
    • Look for small/uniform particles accumulation on target (Day/Night)
    • Speed slide video to determine good start time (D/N)
  • Wet Target
    • Look for small/uniform particles accumulation on target (D/N)
    • Look for no drops in reservoir, if reservoir is filled (D/N)
    • Speed slide video to determine good start time (D/N)
  • Look for reduced visibility  (D/N)
  • Note: Floating motion (D/N)

Drizzle Intensity Change

  • Increasing
    • Look for more small/uniform particles on target (D/N)
    • Look for more coalescence on target producing more frequent fall streaks (D/N)
    • Look for reduction of visibility (D/N)
    • Speed slide video to determine increase time (D/N) (Static Cameras)
    • Volume in camera view increase (pause) (D/N)
  • Decreasing
    • Look for less small/uniform particles on target (D/N)
    • Look for less coalescence on target producing less frequent fall streaks (D/N)
    • Look for increase of visibility (D/N)
    • Speed slide video to determine decrease time (D/N) (Static Cameras)
    • Volume in camera view decrease (pause) (D/N)

Drizzle Ends

  • No more fall streaks (D/N)
  • No more accumulation (D/N)
  • Speed slide video to determine good end time (D/N)